Chart C-12D - Cooling Fan No High Speed Fan (4 Of 4)(3.8L "C" & "H" Bodies)

NOTE: Test numbers refer to test numbers on diagnostic charts.

1. Test light should be on because harness terminals No. 1 and 2 have B+ with ignition switch on.
2. Jumpering harness terminals No. 1 and 4 by-passes relay. If fan runs, relay is faulty.
3. Checks circuit No. 1270 back to PCM. If circuit No. 1270 is okay, relay is faulty.

Fig 1: Chart C-12D Schematic (3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (No High Speed Fan)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart C-12D Flow Chart (4 Of 4)(3.8L "C" & "H" Bodies) Cooling Fan Circuit Diagnosis (No High Speed Fan)

Courtesy of GENERAL MOTORS CORP.